Backpack



FIG. 1 is a front perspective view of the backpack;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The structural elements depicted by broken lines in the drawing have been provided for the purpose of illustrating portions of the backpack that form no part of the claimed design. 

CLAIM The ornamental design for a backpack, as shown and described. 